Lubricating device



l. B. MAcDONALD. LUBBICATING DEVICE. "memo" FILED u. 2:. ms.

Patented Jan. 6, 1920.

Snowmtox 3 v UNITED sTATEsrnTENT OFFICE.

' I an on iBrMeBONAtEDyGF oAn AnncAL-iromvm.

c histamine Zea -ltim s/c m i V ZBe it knewntliat' 'I, J AOK B.MAoDoNAL-u, citizen of the. United States, id t Oakland, in the countyof Al 7, i State. of Calitornia, have invepted certain new and usefulImprovements in Lubricattsitssfi v s is a speci cation.

This invention is a forced lubricating device, particularly adapted foroiling the cylinder and piston of an engine or pump. The invention,however, may be used for other purposes.

In this specification and the annexed drawin I illustrate my inventionin the form w ieh I consider the best, but I do not limit my inventionto such form because it may be embodied in other forms and it is to beunderstood that in and by the claims following the description herein, Iintend to cover my invention in whatever form it ma be embodied.

eferring to the drawing:

Figure 1 is a vertical longitudinal section through a portion of anengine embodying my invention.

ig. 2 is a similar view taken at right angles to Fig. 1.

Fig. 3 is a sectional view of the check valve controlling the pumpingaction of the device.

In the drawing, 1 indicates the cylinder of a gas engine, 2 the crankcase, 3 the piston, 4 the crank shaft, 5 the connecting rod and 6 thewrist pin, connecting the rod to the piston. An annular groove 7 isprovided in the surface of the piston 4, in which groove is placed aring 7 of absorbent material, such as rope or felt. Conduits 8 areprovided in the piston which lead to the groove 7 at various points andwith which a conduit 9, also provided in the piston, communicates withthe conduit 9 leading from a tube 10 secured to the piston. A tube 11 issecured by bracket 12 to the lower part of the crank case 1 and withinthe crank case so that its lowermost end rests within the oil sump 13 ofthe crank case. A tube 14 is secured within the tube and projectsbeyondthe upper end of said tube into the tube 10, slidably fittingwithin the latter tube. The tubes 10, 11 and 14 are so arranged that thetube 14 always extends into the tube 10 no matter what the position ofthe piston and the ends of the tubes 10 and 11 meet when the pistonreaches the 132mm 'rmemwgten.

s: menswear. V ?a;tentedJane6,-192G. week aialaf L limit o f ritsdownward stroke. A check valv 15 l sj fitted in the lower end of thetube 11Jto control the admission of oilinto the u e 4 heval lime Yb of ay u able construction 'su'ch' forlil fifitfatioii as that wn are. a y ashown in .,cnaiu ses a plug it; screwea iatd the assistant the tube '11and provided with an inverted conical conduit 17 extending therethroughand communicating with the end of tube 14, and a ball 18 movable in saidconical conduit and adapted to engage its small end and close it.Conduits 20 lead from the groove 7 into the hollow part of the piston.

As the iston and tube 10 rise a vacuum is created in said tube and thevalve 15 opens and oil is forced under atmospheric pressure up throughtube 14 into tube 10, filling the vacuum therein; and as the piston andtube descend the valve 15 closes and the oil in the tube 10 is forcedthrough conduits 9 and 8 into groove 7 and the absorbent 7f from whichit oozes in between the piston and cylinder, lubricating and cooling thesame.

The advantage of my lubricator over others and particularly the splashsystem is that it positively forces the oil in between the piston andcylinder. Any excess of oil forced into the ring 7 passes through theconduits 20 back into the sump, some of the oil passing into thebearings of the wrist pin 6 and oiling the same.

Having described my invention, I claim:

1. In combination with a piston and cylinder and oil sump, said pistonbeing provided with an annular groove, a tube connected to said pistonfor movement therewith and communicating with said groove, a second tubetelescoping within said first tube and secured in position to extendinto said sump, a check valve in said tube to prevent the escape of oilinto the sump on the expansion stroke of the piston.

2. In combination with a piston and cylinder and oil sump, said pistonbeing provided with an annular groove, a tube connected to the pistonand communicating with said groove, a second tube carried by the pistonand arranged to telescope within said first tube and communicating withsaid sump, a check valve in said second tube to prevent escape of oilinto the sump on the expansion stroke of the piston, and a ring ofabsorbent material in said piston groove.

3. In combination with a piston and oyi vided with an annular groove, apassage inder and oil sump, said piston being procommunicating with saidgroove, a tube eonvided with an annular groove, a tube movneoted to thepiston and telescoping within ing with the piston and communicating withsaid iaas'sa'ge and positioned to communicate said groove, a second tubeeonnected to the with said sump, a check valve in said tube piston'andteleseoping within said first tube tmprevent. escape of oil into thesump on and secured in position to oommunicate the expansion stroke ofthe piston, a ring of with said sump, a check valve in said secondabsorbent material in said piston groove, tube to prevent escape of oilinto the sump said piston being provided with conduits on the expansionstroke of the piston, a ring leading from said piston grooves to returnof absorbent material in said piston groove, the excess oil to the sump,one of said tonand said piston being rovided with conduits Ieading'to apoint over the wrist pin duits leading from sa'i piston grooves to ofthe piston. return the excess ofl'tothe sump. In testimony whereof Iaifix my signature.

4. In combination with a piston and cyl inder and oil' sump, said pistonbeing pro- JACK B. MACDONALD.

